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View Full Version : Distinguish real DVD backup

vio_man
18th October 2007, 13:30
Is there any easy way to distinguish DVD-Video backups from those which are converted using MPEG-4 video as source (using some tool like ConvertXtoDVD) ?
arrirc
18th October 2007, 14:42
The quality should not be same. As the MPEG4 is already compressed so by its nature it has already lost some of the video information available in the original source.
vio_man
18th October 2007, 15:10
But there is any other way to check it, maybe using MediaInfo?
arrirc
18th October 2007, 18:01
MediaInfo will only give you information about the file's Audio and Video codecs and other related information. You can always compare the results for the two files and see that you get what you desire. :)
foxyshadis
18th October 2007, 20:32
You can sometimes tell because the grain is smoothed out or missing entirely, and fine details have been just wiped away, if it was done using a generic Deen script. There's absolutely nothing you could look at in the bitstream, though.
setarip_old
18th October 2007, 23:00
@vio_man

Hi!

Compare it/them to your original, commercial DVD.

Typically, when you've made a true DVD backup copy it will have the same Chapter times and same color/size/font as your original DVD...

On the other side of the coin, why would you first convert your original DVD to MPEG-4 and then back to standard DVD?
vio_man
18th October 2007, 23:57
It was not converted. My brother gave me some DVDs with promo videos (trailers) and I want to know if he converted from MPEG-4 files or backed up from an original disc. I suspect he used some software like ConvertXtoDVD.
setarip_old
19th October 2007, 00:21
My brother gave me some DVDs with promo videos (trailers) and I want to know if he converted from MPEG-4 files or backed up from an original disc.Perhaps I was on better terms with my brother than you are with yours but, can't you just ask him?
vio_man
19th October 2007, 19:34
He says it is a backup from a promo DVD, but I doubt it. Never seen any promo DVD with trailers from different movie studios. Just want to make sure he didn't converted from MPEG-4.
setarip_old
19th October 2007, 20:51
Then the only thing I believe you can do is visually compare it to your brother's original promo DVD...